diff --git a/lib/abtesting/adapter/policy.lua b/lib/abtesting/adapter/policy.lua
index b3333a1..1325535 100644
--- a/lib/abtesting/adapter/policy.lua
+++ b/lib/abtesting/adapter/policy.lua
@@ -106,7 +106,7 @@ _M.del = function(self, id)
     local database      = self.database
     local baseLibrary   = self.baseLibrary
 
-    local policyLib = baseLibrary .. ':' .. id 
+    local policyLib = baseLibrary .. ':' .. id .. ':'
 
     local keys, err = database:keys(policyLib..'*')
     if not keys then
diff --git a/utils/stop-all-nginx.sh b/utils/stop-all-nginx.sh
new file mode 100644
index 0000000..f2e3133
--- /dev/null
+++ b/utils/stop-all-nginx.sh
@@ -0,0 +1,8 @@
+rm *temp -rf
+
+/usr/local/nginx/sbin/nginx -p `pwd` -c conf/nginx.conf  -s stop
+/usr/local/nginx/sbin/nginx -p `pwd` -c conf/stable.conf -s stop
+/usr/local/nginx/sbin/nginx -p `pwd` -c conf/beta1.conf  -s stop
+/usr/local/nginx/sbin/nginx -p `pwd` -c conf/beta2.conf  -s stop
+/usr/local/nginx/sbin/nginx -p `pwd` -c conf/beta3.conf  -s stop
+/usr/local/nginx/sbin/nginx -p `pwd` -c conf/beta4.conf  -s stop